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Date: Tue, 28 Mar 2006 19:17:55 +0100 (BST)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Resolved: (HADOOP-19) Datanode corruption
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     [ http://issues.apache.org/jira/browse/HADOOP-19?page=all ]
     
Doug Cutting resolved HADOOP-19:
--------------------------------

    Resolution: Fixed

I added a format command to namenode.  Now one must run 'bin/hadoop namenode -format' whenever a new dfs.data.dir is configured.  A misconfigured namenode will thus no longer create a new empty filesystem and then tell all datanodes to discard their blocks.

> Datanode corruption
> -------------------
>
>          Key: HADOOP-19
>          URL: http://issues.apache.org/jira/browse/HADOOP-19
>      Project: Hadoop
>         Type: Bug
>   Components: dfs
>     Versions: 0.1
>     Reporter: Rod Taylor
>     Assignee: Doug Cutting
>     Priority: Critical
>      Fix For: 0.1

>
> Our admins accidentally started a second nutch datanode pointing to the same directories as one already running (same machine) which in turn caused the entire contents of the datanode to go disappear.
> This happened because the blocking was based on the username (since fixed in our start scripts) and it was started as two different users.
> The ndfs.name.dir and ndfs.data.dir directories were both completely devoid of content, where they had about 150GB not all that much earlier.
> I think the solution is improved interlocking within the data directory itself (file locked with flock or something similar).

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